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HTML

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                <!-- hyperlinks: target="_blank" for codepen.io -->
  <div class="h-100 d-flex justify-content-center align-content-between flex-wrap">
    <div class="container text-center p-3">
      <h1>myWikipedia</h1>
      <span><em>An alternative Wikipedia landing page.</em></span>
      <p id="message" class="text-red"></p>
      <div class="row justify-content-center">
        <div class="col-12 col-sm-6 col-md-7 col-lg-8 py-0 py-sm-3 text-right">

          <div class="input-group">
            <input id="search-keywords" type="text" class="form-control" placeholder="Search for an article...">
            <span class="input-group-btn">
              <button id="search-btn" class="btn btn-warning">Go!</button>
            </span>
          </div>

        </div>
        <div class="col-12 col-sm-1 col-md-1 col-lg-1 py-1 align-self-center text-center">
          <span>or</span>
        </div>
        <div class="col-12 col-sm-5 col-md-4 col-lg-3 pt-0 pb-3 py-sm-3 text-center text-sm-left">
          <a href="https://en.wikipedia.org/wiki/Special:Random" target="_blank">
            <button type="button" class="btn btn-warning">Get a Random Entry!</button>
          </a>
        </div>
      </div>
    </div>

    <div class="container mx-2">
      <div id="search-results" class="list-group row">
      </div>
    </div>

    <div class="container p-3 w-100">
      <p class="text-center">Coded by <a class="text-danger" href="http://gregwong.me">Greg Wong</a></p>
    </div>
  </div>
!

CSS 

              
                html, body {
  height: 100%;
  background-color: #FFE3B7;
}

.content-entry {
  background-color: #FFEFD6;
  padding-top: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgb(223,223,223);
  color: #603B01;
}

.content-entry:focus, .content-entry:hover {
  background-color: #FFD695;
  color: #A06200;
}

.text-red {
  color: red;
}
!

JS 

              
                $('input#search-keywords').keypress(function (e) {
    var code = e.keyCode || e.which;
    $("p#message").text("");
    if (code === 13){
      e.preventDefault();
      searchStart();
    }
});

$('button#search-btn').click(function(){
  searchStart();
});

function searchStart(){
  $("p#message").text("Searching...");
  var keywords = $("input#search-keywords").val();
  if (keywords != ""){
    var url = "https://en.wikipedia.org/w/api.php?action=query&prop=extracts&format=json&exintro=1&explaintext=1&titles=&generator=search&gsrsearch="+keywords +"&callback=?";
    $.getJSON(url).done(searchDone).fail(function(){
      $("p#message").text("Search results failed to load. Try again later!").effect("shake");
    });
  }
  else {
    $("p#message").text("Search bar is empty!");
    $("input#search-keywords").parent().effect("shake");
  }
}

function searchDone(json){
    $("p#message").text("");
    var entries = "";
    var pages = json.query.pages;
    for (var pageid in pages){
      var href = "https://en.wikipedia.org/wiki?curid=" + pageid ;
      var title = pages[pageid].title;
      var extract = pages[pageid].extract;
      var entry = '<a href="' + href + '" class="list-group-item content-entry" target="_blank"><h5 class="w-100">' + title + '</h5><span>' + extract + '</span></a>';
      entries = entries.concat(entry);
    }
    $("div#search-results").empty().append(entries).hide().fadeIn("slow", function() { });
}

$('div#search-results').on('click', 'a.content-entry',function(){
  // without this, the selected entry stays highlighted
  $(this).blur();
});
!
999px

Console